Spectracom Corporation
8194B, 8195B, 8197B
GPS Ageless Master Oscillator Instruction Manual
4-15
The overall tracking and mode status is presented in the format shown below:
TRACKING N SATELLITES
GPS STATE = SSSSS DOP=##.#
QUALITY = QQQQQ
Where:
N
=
Number
of
satellites currently tracking, 0…8.
SSSSS
=
Fix
Mode,
2-D fix, 3-D fix, Pos-Hold, Other
##.#
=
Dilution of Precision, 00.0…99.9.
This value indicates the degree of uncertainty in a position
fix. When in Position Hold Mode, this value shall be 00.0. In
all other Fix Modes, the lower the DOP value, except 00.0,
the lower the degree of uncertainty.
QQQQQ
=
Results of GPS qualification, Passed, Failed.
The received quality of the GPS signal is continuously
monitored. The criteria used in qualifying the GPS signal is
listed below:
•
Dilution of Precision, 0
≤
DOP<10
•
Vehicle Identification Number, VID>1
•
Channel Tracking Mode, MODE=08
•
Relative Signal Strength, STREN>40
•
Position Fix Bit Set, BIT7=1
The GPS signal is qualified whenever four or more satellites meet the above criteria for
one minute.
Information on each satellite the receiver is currently tracking is presented in table form.
The table columns are described below:
CHAN = Channel Number of the GPS receiver, 01...08
VID =
Vehicle (satellite) Identification Number, 01...37
MODE = Channel Tracking Mode, 01...08.
Where:
00 - Code Search 05 - Message Sync Detect
01 - Code Acquire 06 - Satellite Time Avail
02 - AGC Set
07 - Ephemeris Acquire
03 - Freq Acquire 08 - Avail for Position
04 - Bit Sync Detect
STREN = Signal strength value relative to SNR, 00...55. The higher the
number, the greater the received signal. The minimum acceptable
level is 40.
STAT = Channel status flag. Convert the hexadecimal code word to binary to
find the status flags set.
Содержание 8194B
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